made in gimp, with <3

::: spoiler Context for actual rust programmers I was having massive beef with the rust compiler yesterday, every cargo check takes 20 seconds.

And then look at the three functions below, only one of them are Send, if you know why, please let me know.

(Note: value that is not Send cannot be held across an await point, and Box is not Send)

async fn one() {
    let res: Result<(), Box<dyn Error>> = do_stuff();
    if let Err(err) = res {
        let content = err.to_string();
        let _ = do_stuff(content).await;
    }
}

async fn two() {
    let res: Result<(), Box<dyn Error>> = do_stuff();
    let content = if let Err(err) = res {
        Some(err.to_string())
    } else {
        None
    };
    drop(res);
    if let Some(content) = content {
        let _ = do_stuff(content).await;
    }
}

async fn three() {
    let content = {
        let res: Result<(), Box<dyn Error>> = do_stuff();
        if let Err(err) = res {
            Some(err.to_string())
        } else {
            None
        }
    };
    if let Some(content) = content {
        let _ = do_stuff(content).await;
    }
}

:::

When does this hold?

(x^p + y^p) ^ (1/p) = (x^q + y^q) ^ (1/q)

Question

• Find the function f such that f'' = -f
• Show that the function can be written in format f = A sin(x + B)

Extension

Find a function g such that g'' = C * -g and

• g(0) = D
• g'(0) = 0 where C and D are arbitrary constants.

::: spoiler For those who have finished the extension Congratulations, you have just derived the formula for objects in simple harmonic motions (physics). :::

• Contour lines joins up points on a surface that are of the same height.
• Field lines points towards the direction of the steepest descent.

As you may have noticed, whenever a field line and contour line crosses each other, they are perpendicular.

Prove it.

heres my current ops after first listen

::: spoiler Spoilers sounds amazing:

• cut the bridge
• overflow
• stained
• good things go

give it some time:

• two faced
• IGYEIH

no:

• casualty :::

casualty after over each other is pretty cool

and just would like to say, good things go sounds like a mike shinoda song than LP

Yeah I can't lie, there is no calling this a daily challenge now.

Anyhow, have a go at proving this, I don't want any unrigorous "imagine zooming in until the line is straight" nonsense.

Difficulty: not a lot

Would appreciate if u put ur proofs or attempts below, I got a proof but it's like kinda mediocre.

In light of events following the previous post, it is almost certain shelling of the UN peacekeepers camp was not an accident from attacking nearby hezbollah tunnels.

The UN forces are the target of the Israeli army, as bulldozers usually dont accidentally show up in a warzone to specifically bulldoze a UN watch tower.

Oct 20 (Reuters) - The U.N. peacekeeping force in Lebanon (UNIFIL) said in a statement that an Israeli army bulldozer had demolished an observation tower and perimeter fence of a U.N. position in Marwahin in southern Lebanon on Sunday.

Their reasonings isn't making the slightest sense at all, so unless the article forgot to mention something entirely, this is rediculous.

Follow up post: https://lemmy.world/post/21092844

all nostalgia aside, arras.io is so much better

Draw a hypocycloid using a graphical calculator (such as Desmos or Geogebra).

Your hypocycloid should include

• Inner circle of radius `a
• Outer circle of radius `b
• As time t increases the point on the inner circle should trace out the pattern, you can animate the graph using t.

Below is the link to a Desmos graph:

https://www.desmos.com/calculator/vzgog7xqrz

• Given n and m are coprime, show that there exist integer n' such that nn' mod m=1.
• The extended Euclid's algorithm is given below without proof, which may be useful in your proof.

(I'm too lazy to type out the algorithm again, so look at the image yourself)